Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
metamorphic
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Limonite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O)
mineral
Fossil Snail
Gastropoda fossil
fossil
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Crocidolite
metamorphic
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Green Quartzite
Quartzite (primarily SiO2 with trace impurities)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Geode
Crystalline Quartz (SiO2) within a nodule
sedimentary
Common Opal (Potch)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Fossilized Blastoid (Sea Bud)
Pentremites sp. (Echinodermata, Blastoidea)
fossil
Rhodonite
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Granitic Pegmatite with Graphic Texture
Graphic Granite (alkali feldspar and quartz intergrowth)
igneous
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Snowflake Obsidian and Green Aventurine
Volcanic Glass (SiO2 with Cristobalite inclusions) and Quartz (SiO2 with Fuchsite)
igneous and metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
igneous
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous